SQL 2008 T SQL output Stored Procedure to .txt

Using SQL 2008, I'm trying to use a Stored Procedure to write the contents of a SP to a .txt file. I can select the SP definition and can write content to .txt no problem. When trying to write the SP definition to .txt, assigned to a @str varchar(max), nothing is written to the file.

DECLARE @str varchar(max), @filename varchar(max), @ExportTXT varchar(max)
SET @filename = 'c:\test.txt'
SET @str = (select top 1 definition from sys.sql_modules, information_schema.routines where LEFT(information_schema.routines.routine_definition,200) = LEFT(sys.sql_modules.definition,200)  

SET @ExportTXT = 'echo foo: ' + '>>' + @filename
EXEC master..xp_cmdshell @ExportTXT

SET @ExportTXT = 'echo ' + @str + '>>' + @filename
EXEC master..xp_cmdshell @ExportTXT

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The above writes the line 'foo:' but nothing after it.

Related to this question, how do I force a line break without using a new echo command + call to EXEC master..xp_cmdshell. I'd rather write once to the .txt file than multiple times.
drl1Asked:
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DBAduck - Ben MillerConnect With a Mentor Principal ConsultantCommented:
You could use something like this:

SET @str = 'sqlcmd -E -Sinstancename -Q "EXEC sp_helptext ''' + @procname + '''" -o "' + @filename + '"'
EXEC master..xp_cmdshell @str

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DBAduck - Ben MillerPrincipal ConsultantCommented:
Try something like this.  When using Echo, you need to have the string enclosed in " "

SET @ExportTXT = 'echo "' + @str + '" >>' + @filename
EXEC master..xp_cmdshell @ExportTXT 

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drl1Author Commented:
The @str variable is defined as a string, is already encapsulated in single quotes in T SQL (i.e. a string) and works fine if I assign a short string such as 'foobar' (without single quotes) to @str and don't use your suggested double quotes, so that's not the issue.

I think i've narrowed this down to the size of the Stored Proc being too large to be held in the @str variable despite this variable being defined as varchar(max). The SP is around 40,000 characters including blank spaces.
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DBAduck - Ben MillerPrincipal ConsultantCommented:
Sorry, I did not read that it was the "contents" of the stored proc.  You have a limit of 256 characters on that command line. So 40,000 will be outside that range.
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drl1Author Commented:
Within the Echo command line? That would explain it. How can I dump 40k chars to a txt file or more simply just have the stored proc save a copy of itself as a txt file?
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David ToddSenior DBACommented:
Hi,

I'm wondering if using the SQL command mode may help here. Its not a stored procedure, but would be a sql script that can be scheduled and automated.

Just a thought

Regards
  David
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drl1Author Commented:
Would the SP call the sql script which in turn saves a copy of the SP to txt? It's not something that I need scheduling as the dump to txt needs to run at each point that the SP is fired, which is currently a manual process.
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